Some basic facts about coal fineness for blending

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　　Fineness refers to the mass fraction of coal particles smaller than 3 MM in the total mass of the coal after it has been crushed. 　　　　　1. It is generally maintained at over 80% (we keep it above 85%), with fluctuations between adjacent teams not exceeding 2% ； 　　　　2. The fineness is too low, resulting in uneven mixing of the coal materials and reduced coke strength ； 　　　　3. Excessive fineness increases the consumption of the crusher, reduces the bulk density of the coal charge, and affects the quality of coke. 　　　　4. Minimize the content of particles smaller than 0.5 MM in order to reduce dust during coal loading, prevent an increase in tar residues in the gas collection pipes from affecting the quality of the tar, and reduce blockages in the riser pipes. 　　　　5. Different coal types have varying requirements regarding fineness; for example, weakly caking coal requires a high degree of fineness and must be finely ground ； Highly cohesive coal should be finely ground. (Fat coal/coking coal should be in coarse powder form, while bituminous coal should be finely ground, etc.)